Supplementary chuck.



Patented Ian. 22, IQOI, Z. T. FURBISH.

SUPPLEMENTARY CHUCK.

.(Application filed Apr. 11, 1900.)

ms TERS o0. mom-urua. WASNINGTDN, u. c.

(No Model.)

Units TATES ZAOHRY T. FURBISH, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNORTO THE NORTH BROTHERS MANUFACTURING COMPANY, OF SAME PLACE.

SUPPLEMENTARY CHUCK.

SPECIFICATION forming part of Letters Patent No. 666,51 1, dated January22, 1901.

Application filed April 11, 1900. Serial No. 12,482. (No model.)

f all whom it may concern.-

Be it known that I, ZAOHRY T. FURBIsH, a citizen of the United States,residing in Philadelphia, Pennsylvania, haveinvented certainImprovements in Supplementary Chucks, of which the following is aspecification.

The object of my invention is to provide a supplementary chuck which canbe used to secure a small drill-bit to a chuck having a socket larger indiameter than the drill-bit. This object I attain in the followingmanner, reference being had to the accompanying drawings, in WhichFigure 1 is a longitudinal sectional view of my improved supplementarychuck. Fig. 2 is a sectional view on the line 2 2, Fig. 1. Fig. 3 is aView showing the ball in engagement with the drill-stock. Fig. 4 is asection on the line 4 l, Fig. 3; and Fig. 5 is a perspective viewshowing the parts detached.

A is the body of the chuck, having a shank A, fittinga socket in a chuckof larger size. The end of the shank in the present instance is notchedat a to engage the notched portion of the larger chuck, so that thesmall chuck shall turn with the larger chuck, and the shank is alsonotched at a, so that a lock on the larger chuck will prevent thewithdrawal of the smaller chuck until the lock is released.

The body A of the chuck has an opening 0 for the drill-bit or other tool0, Fig. 3, and is grooved at c, forming the notch in the chuck, withwhich the end of the tool engages, as shown in Fig. 3.

A transverse sockett' is formed in the chuck, which communicates withthe opening 0, and mounted in the socket t' is a ball I. The ball is ofsuch a diameter that it can extend into the longitudinal opening 0, asshown in Fig. 3. The socket v is tapered, so as to prevent the ballpassing entirely out of the socket, theltapered end limiting themovement of the bal r B is a sleeve mounted on the body of the chuck,and this sleeve has a recess 1), into which the ball enters when thesleeve is in line with the socket t, as shown in Figs. 1 and 2, so thatthe ball will be clear of the opening 0 and the shank of a drill can beplaced in position or withdrawn from the chuck; but

when the sleeve B is turned, as shown in Fig. 4, the ball is forced intothe opening 0, and if the drill-bit is in the position shown in Fig. 3the ball will enter a notch in the drill-bit and prevent it beingremoved from the chuck.

The sleeve B is slotted at b, and extending through the slot is ascrew-pin e, which not only holds the sleeve in position longitudinallyon the body of the chuck, but also limits its rotary motion.

I preferably mount on the pin e in a groove 0, in the body of the chucka spring-plate E, so as to place sufficient friction upon the sleevethat it will remain in the position to which it is moved, so that thesleeve will not shift accidentally.

It will be seen that the chuck can be cheaply manufactured, will take upvery little room, and can be readily used as a coup- 7o ling forsecuring a drill-bit of small diameter to a chuck having a large socket.

I claim as my invention 1. The combination in a chuck, of a body portionhavinga longitudinal opening therein for the drill or other tool, atransverse socket, a ball in the socket, a sleeve mounted on the body ofthe chuck and grooved to receive the ball, with means for limiting themovement of the sleeve, substantially as described.

2. The combination of the body of a chuck, an opening therein for adrill or othertool, atapered socket, a ball in said socket, a sleevemounted on the body of the chuck and grooved to receive the ball,a stopto limit the rotary mo- 8 5 tion of the sleeve so that it will eitherallow the ball to enter its groove or be forced into the longitudinalopening for the bit, substantially as described.

3. The combination of the body of a chuck 90 having a longitudinalopening and a socket,

a ball in said socket, a sleeve mounted on the body of the chuck andcontrolling the movement of the ball, and a spring mounted between thesleeve and the body of the chuck 5 so as to retain the sleeve byfriction in its adjusted position, substantially as described.

4. The combination of a chuck-body, a 1ongitudinal opening therein forthe drill or other tool, a socket, a ball in said socket, a sleeve 10omounted on the body of the chuck having a groove therein for thereception of a portion of the ball, said sleeve being slotted, a pinname to this specification in the presence of projecting from the bodyof the chuck into two subscribing witnesses.

the slot, and a splin mounted between the 4 sleeve and the bod; of thechuck and held ZACHRY FURBISH' 5 in position by the pin, substantiallyas de- Witnesses:

scribed. I WILL. A. BARR,

In testimony whereof I have signed my i JOS. H. KLEIN.

